The activated carbon bag can remove impurities, calcium, chlorine and odors to create the tastiest drinks. These replacement filters are specifically designed for all coffee makers replacement for Keurig that require water filters made after 2007. Features: Removes impurities (chlorine, odors, calcium and others) that interfere with taste and quality. Ensures that the charcoal remains in the filter and does not obstruct your coffee machine. The finer granules of coal increase the surface area’s exposure to water and maximize effective filtration. Replacement for Keurig 2.0 brewer, E-lite B40, Cassic B44, Ultra B50, Special Edition B60, Ultimate B66, Plantinum B70, Plantinum K79 Plus, Officepro B145, B140, B145, B40, B45 Elite, B60, B68, B70, B75, B79, B80, K145, K155, K200, K350, K40, K45 Elite, K500, K60, K65, K66, K75. Works with (but not limited to) all of these models. Applicable for coffee machine, water dispenser, sports bottle, etc. Specifications: Material: Activated Carbon +